Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Start the inspection from step 1 in the case of using the intelligent tester, and start from step 2 in the case of not using the intelligent tester.

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

Connect the intelligent tester to DLC3.
Turn the ignition switch to ON and push the intelligent tester main switch ON.
Select the item below in the ACTIVE TEST and then check that the relay operates.

Body:

ACTIVE TEST TABLE

Item	Test Details	Diagnostic Note
HEAD LIGHT	Turns Headlight relay ON/OFF	-

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG: Go to next step.

INSPECT HEADLIGHT RELAY

Fig 1: Identifying Headlight Relay Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Inspect relay continuity.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
1 - 2	Always	Below 1 Ω
3 - 5	Always	10 kΩ or higher
3 - 5	Apply +B between terminal 1 and 2	Below 1 Ω

NG: REPLACE HEADLIGHT RELAY

OK: Go to next step.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (HRLY)

Fig 2: Identifying Instrument Panel Junction Block Assembly Connector Terminals (HRLY)

Disconnect the connector.

Measure the voltage between terminal HRLY of the instrument panel J/B assembly (driver side J/B assembly) on the wire harness side and body ground.

Standard voltage

TERMINAL SPECIFIED CONDITION

Terminal No. (Symbols)	Condition	Specified Condition
IB-8 - Body ground (HRLY - Body ground)	Always	10 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE